Hello .
Based on the history provided, we cannot conclude that this can be possiblt related to
HIV. Firstly as you turned non reactive on the tests. There is no evidence for HIV. Secondly the symptoms responded to antihistamines thus mostly liked it is allergic in origin.
Do not have to worry and no additional tests are needed at this point in time.
Eat healthy . Exceecise and build up Immunity. That helps.